60 butterflies were recorded flying in Missouri in October in our iNaturalist sample; 3 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in October

Monarch

Common Buckeye

Painted Lady

Fiery Skipper
Huron Skipper

Pearl Crescent

Orange Sulphur

Common Checkered-Skipper

Cloudless Sulphur

Eastern Comma

Small White

Variegated Fritillary
All butterflies flying in Missouri in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Monarch | Danaus plexippus | Brush-footed Butterflies | 715 | Sep (past peak) |
| 2 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 421 | Sep (past peak) |
| 3 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 388 | Sep (past peak) |
| 4 | Fiery Skipper | Hylephila phyleus | Skippers | 384 | Sep (past peak) |
| 5 | Huron Skipper | Atalopedes huron | Skippers | 317 | Sep (past peak) |
| 6 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 284 | Sep (past peak) |
| 7 | Orange Sulphur | Colias eurytheme | Whites, Yellows, and Sulphurs | 212 | Oct (peak) |
| 8 | Common Checkered-Skipper | Burnsius communis | Skippers | 171 | Oct (peak) |
| 9 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 170 | Sep (past peak) |
| 10 | Eastern Comma | Polygonia comma | Brush-footed Butterflies | 143 | Sep (past peak) |
| 11 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 138 | Sep (past peak) |
| 12 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 135 | Sep (past peak) |
| 13 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 134 | Sep (past peak) |
| 14 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 111 | Sep (past peak) |
| 15 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 109 | Sep (past peak) |
| 16 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 108 | Jul (past peak) |
| 17 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 107 | Aug (past peak) |
| 18 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 102 | Sep (past peak) |
| 19 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 96 | Sep (past peak) |
| 20 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 80 | Sep (past peak) |
| 21 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 58 | Apr (past peak) |
| 22 | Checkered White | Pontia protodice | Whites, Yellows, and Sulphurs | 52 | Jul (past peak) |
| 23 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 50 | Aug (past peak) |
| 24 | Great Spangled Fritillary | Argynnis cybele | Brush-footed Butterflies | 48 | Jun (past peak) |
| 25 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 44 | Aug (past peak) |
| 26 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 38 | Sep (past peak) |
| 27 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 37 | Aug (past peak) |
| 28 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 35 | Apr (past peak) |
| 29 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 34 | May (past peak) |
| 30 | Clouded Skipper | Lerema accius | Skippers | 30 | Oct (peak) |
| 31 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 29 | Aug (past peak) |
| 32 | Bronze Copper | Tharsalea hyllus | Gossamer-winged Butterflies | 25 | Jul (past peak) |
| 33 | Ocola Skipper | Panoquina ocola | Skippers | 23 | Sep (past peak) |
| 34 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 21 | Aug (past peak) |
| 35 | Sleepy Orange | Eurema nicippe | Whites, Yellows, and Sulphurs | 19 | Sep (past peak) |
| 36 | Clouded Sulphur | Colias philodice | Whites, Yellows, and Sulphurs | 16 | Sep (past peak) |
| 37 | Southern Dogface | Zerene cesonia | Whites, Yellows, and Sulphurs | 15 | Sep (past peak) |
| 38 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 14 | Sep (past peak) |
| 39 | Mourning Cloak | Nymphalis antiopa | Brush-footed Butterflies | 13 | Mar (past peak) |
| 40 | Gray Comma | Polygonia progne | Brush-footed Butterflies | 13 | Mar (past peak) |
| 41 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 10 | Aug (past peak) |
| 42 | Least Skipper | Ancyloxypha numitor | Skippers | 9 | Jul (past peak) |
| 43 | Wild Indigo Duskywing | Erynnis baptisiae | Skippers | 8 | Sep (past peak) |
| 44 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 7 | Jul (past peak) |
| 45 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 7 | Aug (past peak) |
| 46 | Peck's Skipper | Polites peckius | Skippers | 7 | Jul (past peak) |
| 47 | Tawny-edged Skipper | Polites themistocles | Skippers | 5 | Sep (past peak) |
| 48 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 5 | Jul (past peak) |
| 49 | Zabulon Skipper | Lon zabulon | Skippers | 5 | Aug (past peak) |
| 50 | Ceraunus Blue | Hemiargus ceraunus | Gossamer-winged Butterflies | 4 | Sep (past peak) |